Purpose: The aim of this research was comparison the development of ownership concept in preschool and elementary school children. Methodology: Present study in terms of purpose was applied and in terms of implementation was causal comparative. Research statistical population was all male and female children of preschool and elementary school of Pakdasht township in 2017-18 academic years. The research sample was 100 people (25 people in each grade) who were selected by random cluster sampling method. To collect data used from individually structured interview (31 questions) that the face and content validity of interview questions was confirmed by the educational sciences and psychology experts and its reliability was reported desirable by method of examiners. Data were analyzed by multivariate analysis of variance method in SPSS software version 19. Findings: The findings showed that there was a significant difference between the overall scores of the groups in the objective questions (P<0.05), but there was no significant difference between them in the descriptive questions (P>0.05). Conclusion: The results showed that preschool and first year elementary school children in compared to third and fifth year elementary school children do not have a good understanding and these children, unlike third and fifth year elementary school children, consider the first person who associates with the object as its owner.
